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thornback

[thawrn-bak]

noun

a skate, Raja clavata, of European waters, having short spines on the back and tail.

a California ray, Platyrhinoidis triseriatus, belonging to the guitarfish group.

Origin:
1250–1300; Middle English; see thorn, back¹

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Thornback is always a great word to know.

So is zedonk. Does it mean:

the offspring of a zebra and a donkey.

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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Collins

World English Dictionary

thornback (ˈθɔːnˌbæk)

—n
1.	a European ray, Raja clavata, having a row of spines along the back and tail
2.	a similar fish, Platyrhinoidis triseriata, of the Pacific Ocean

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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thornback

thorn·back